Radiation Shields
A fairly decent outdoor enclosure for the temperature and humidity sensors can be made by obtaining small plastic attic vents from a local supply store and attaching them to a frame of 2 X 2's. If the vents have small plastic slits for circulation instead of screen, you may need to cut out the plastic louvers and then line the inside of the enclosure with window screen. The one shown here did not allow enough air circulation initially. The temperature was always higher than it should have been until this was done. The mount was fabricated using a galvanized pipe driven into the ground and a pipe flange to attach the enclosure. The completed enclosure is shown to the right. | ![]() |
The above homebrew enclosure has since been replaced with a commercial one from Davis Instruments. While the homebrew enclosure was better than none, the Davis shield is very good. Temperature readings are now virtually immune to influence of sunlight heating the enclosure. This and other readily available radiation shields can be found at The Weather Shop. They have a good selections and prices. | ![]() |
Another homebrew enclosure was designed by Russ Chadwick, KB0TVJ. Construction notes along with good pictures of the project can be seen at http://www.beals5.com/wx/shield.htm. This site belongs to Will Beals, N0XGA. Will and Russ are the developers of the T-238/T-238+.